21752270 has 16 divisors (see below), whose sum is σ = 39706848. Its totient is φ = 8578080.

The previous prime is 21752267. The next prime is 21752293. The reversal of 21752270 is 7225712.

It is a super-2 number, since 2×21752270² = 946322500305800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14609 + ... + 16028.

It is an arithmetic number, because the mean of its divisors is an integer number (2481678).

Almost surely, 2^21752270 is an apocalyptic number.

21752270 is a deficient number, since it is larger than the sum of its proper divisors (17954578).

21752270 is a wasteful number, since it uses less digits than its factorization.

21752270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30715.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21752270 is about 4663.9328897402. The cubic root of 21752270 is about 279.1482192706.

Subtracting from 21752270 its product of nonzero digits (1960), we obtain a triangular number (21750310 = T₆₅₉₅).

Adding to 21752270 its reverse (7225712), we get a palindrome (28977982).

It can be divided in two parts, 21752 and 270, that added together give a palindrome (22022).

The spelling of 21752270 in words is "twenty-one million, seven hundred fifty-two thousand, two hundred seventy".